Tianyi Cui
8fd7ff69e3
A summary can fail while appending turn/start or turn/end and still leave
the root idle with a stable Session sequence. The SDK wait operation then
returned {}, letting the external provider treat the preceding completed
terminal as the result of the entire task. A listener installed only for
the wait would also miss failures between prompt admission and the wait
request.
Retain one latest live failure on each existing SDK Session record, scoped
to the exact owned Agent. Record the Session's next log offset when the
failure occurs. A turn/end from the exact owned Session clears it only
when that terminal was committed at or after that offset. This preserves
failures raised during terminal publication, keeps ordinary represented
turn errors in the durable outcome, and permits later successful activity
to recover. At stable root/descendant completion, session/wait rejects any
remaining failure. Raw session.status and HarnessSession.run behavior are
unchanged; no generic failure history or new notification is introduced.
Add seven owner-local cases for later start/end failures before and during
wait, subsequent successful prompts, represented errors, and publication
ordering including an undefined thrown value. Six failure cases returned
success before the fix. Strengthen listener teardown coverage to assert
all actual subscriptions are disposed after a disposer fails.
Extend the existing recorded subagent-continuable SDK scenario to exercise
session/wait. It still asserts that run() returns DONE at parent turn 1,
then requires child completion and parent turn 2/idle plus its final
summary to be delivered before the wait response. Bypassing the wait made
that ordering assertion fail. No recorded Session or golden output was
invented or refreshed. Update the protocol/server bilingual READMEs and
regenerate the event-consumer matrix for the new error listener.
Validation:
- pnpm exec vitest run packages/sdk/server/tests/wait.spec.ts before the fix:
6 failed, 1 passed (the represented-error case)
- pnpm exec vitest run packages/sdk/server/tests/server.spec.ts packages/sdk/server/tests/wait.spec.ts (40 passed)
- pnpm run test:e2e packages/subagent/subagent-dsh-sdk/tests/nested-delegation.e2e.ts packages/subagent/subagent-dsh-sdk/tests/loader-composition.e2e.ts (8 passed)
- DSH_EXAMPLE_MODE=lib pnpm run test:e2e packages/subagent/subagent-dsh-sdk/tests/nested-delegation.e2e.ts packages/subagent/subagent-dsh-sdk/tests/loader-composition.e2e.ts (8 passed)
- pnpm run test:snapshot snapshots/sdk/sdk.snapshot.ts -t 'replays subagent-continuable through dsh --profile sdk' (1 passed, 24 unselected)
- pnpm run doc-sync: Host compile/bundle, doc-typecheck and 40 other gates
passed; the generated event graph was stale, then regenerated and passed
pnpm run verify-doc-graphs (all 7 graph docs current)
- pnpm run lint:contracts-ready and focused lint of all changed SDK code
- named translation pairing checks and git diff --check
Independent SDK rereview and 7/7 focused tests found no remaining issue.
The parent task owns unchanged Python advanced/recovery validation on the
combined branch; this commit changes no Python or high-level SDK results.
DeepSeek Harness
English | 中文
DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
It is built on an everything-is-a-plugin architecture and powered by Cordis, whose design is described in A Programming Paradigm for Spatiotemporal Composability.
Documentation: https://deepseek-harness.github.io/deepseek-harness/
Developer preview
DeepSeek Harness is in developer preview and iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.
Review the safety notice before running the project.
Run
Run from npm
Install Node.js, then run:
npx @deepseek-ai/dsh web
The command starts the Web UI at http://127.0.0.1:3080 by default and opens it in the default browser for a local launch. An SSH launch only prints the host URL because the SSH client or editor owns the local forwarded address. Pass --no-open to run the server without opening a browser. See Web UI guide.
Run from source
To run from a repository checkout:
git clone https://github.com/deepseek-ai/deepseek-harness.git
cd deepseek-harness
pnpm install
pnpm run build
pnpm dsh web
pnpm run build prepares the repository artifacts. pnpm dsh web uses those built artifacts without rebuilding.
Community and support
- Submit feedback or bug reports through GitHub Discussions.
- Add the
dsh-plugintopic to your plugin repository for discoverability. - Join DeepSeek Harness Discord community.
Contributing
See CONTRIBUTING.md.
Development
Start with the development guide and architecture documentation.
pnpm run dev:web builds, serves, and rebuilds client bundles on source edits in one terminal, and make help lists the matching Make targets for Web and Desktop; the guide's application commands section owns the full table.
For agents, follow AGENTS.md.
Citation
@misc{deepseek-harness2026,
title={DeepSeek Harness: Everything is a Plugin},
author={DeepSeek-AI},
year={2026},
publisher={GitHub},
howpublished={\url{https://github.com/deepseek-ai/deepseek-harness}},
}
License
Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.